Year	Percent change (Units)
2003	87.518
2004	-29.694
2005	13.425
2006	-32.393
2007	36.237
2008	51.106
2009	-21.253
2010	-2.114
2011	-10.383
2012	10.546
2013	5.228
2014	35.572
2015	15.494
2016	12.256
2017	17.629
2018	2.578
2019	1.872
2020	-16.606